Process for making bags and the like



Jan. 29, 1935. A. POTDEVIN 1,989,111

PROCESS FOR MAKING BAGS AND THE LIKE Filed Sept. :50, 1952 IN VEN TOR.

a; BY

M ATTORNES.

Patented Jan. 29, 1935 UNITED STATES PROCESS FOR MAKING BAGS AND THELIKE- Adolph Potdevin, Garden City, N. Y., assignor to Potdevin MachineCompany, Broo yn, N. Y., a corporation of New York Application September80, 1932, Serial No. 635,495

3 Claims.

This invention is directed to a method of and apparatus for use inconnection with the making of bags particularly bags of glassine andother fragile materials.

In the drawing accompanying this application:

Fig. 1 is a plan view of a machine or apparatus adapted for the practiceof my invention;

Fig. 2 is a side elevational view of the same; and

Figs. 3 and 4 are views of bags embodying my invention.

Referring to the drawing in detail, the material from which the bags areto be made is taken from a supply roll 1, the web 2 passing aboutrollers 3 and 4 to -be brought into contact with.

circumferentially adjustable gluing disc segment 5.

After receiving the stripe of glue or other adhesive which is shown inFig. 1 and designated 6, the material is forwardedto the notchingdevices 7, one at either side of the machine, these devices beingrotated about axes parallel to the web travel and adapted to cut notches8 in opposite edges of the web, while the web is in web form asdistinguished from a tube. The notches 8 are at bag lengths apart, andas the notching devices 7 move transversely of the web on their shafts 9the web may be varied in speed to vary the spacing of the notcheswithout the necessity of changing .the setting of the notchers. As abovementioned the gluing disc 5 is circumferentially adjustable, so that theterminals of the stripes 6 may be varied in accordance with any changein location of the notches 8, the notches to be positioned betweenadjacent ends of the stripes.

After passing the notching mechanism '7 the material goes through tubingmechanism where the notched edges of the web are folded over towardveach other into overlapped relation to bring the stripe of adhesive 6over upon the main body of the web 2 and provide a longitudinal seam 10.In this tubing operation the outer ends of the notches 8 are broughttogether to provide one large opening. 11 in the upper or seam wall ofthe tube (see Fig. 1), the notches terminating short of the tube edges.

The tube then passes to cutting-oi! mechanism comprising rotary knife 12and fixed knife 13 which severe the tube transversely into bag lengths.The knife 12 of the cutting of! mechanism moves about an axis which isparallel to the travel of the tube and is so timed with respect to thespeed of the tube that the tube is severed across the center of theopening 11 above referred to in the upper wall of the tube, sothat eachbag length, as shown in Fig. 1, will have a notch in one wall thereof ateach end. These notches I have designated 14 and 15. A be:

length is shown at the left in Fig. 1 and has been designated 16. I

The bag lengths are then satchel bottomed as shown in Fig. 3, thecorners being tucked in as shown at 17 and 18, the upper wall foldedback along the line 19, the portion 20 of this folded back portion whichincludes the notch 15 folded forward along the line 21, and the portion22 of the lower wall folded forward upon the portion 20 of the upperwall.

In Fig. 4 I have shown a satchel bottom bag similar to the bag of Fig.3, except that this bag of the tube, and then severing the webtransverse- 1y intermediate the sides of the notches to form bag lengthswith a longitudinal notch-in one wall at each end of the bag length.

2. The process of forming bags from a web of material which processcomprises forming notches in opposite edges of the web, said notchesbeing positioned abreast of each other, folding the web edges towardeach other along lines intermediate the bottom of opposed notches tooverlap the web edges and to overlap the notches and bring-them into theseam wall of the tube thus formed, with the notches terminating short ofthe edges of the tube, and then severing the web transversely midway ofthe sides of the notches to form bag lengths having a longitudinal notchin the seam wall at each end of the bag length.

3. The process of forming bags from aweb of continuously advancingmaterial which process comprises applying adhesive stripes in spacedrelation aligned longitudinally of the web adjacent one edge thereof,notching opposite edges of the web, the notches lying abreast of eachother and those in the edge of the web to which adhesive has beenapplied lying in the spaces between adjacent ends of the adhesivestripes, folding the notched edges of the web toward each other intooverlappedrelation to tube the web and to bring the notches into onewall of the web in overlapped relation, said notches terminating shortof the tube edges, severing the tube transversely midway between thesides of said notches to provide bag lengths with a longitudinal notchin the seam wall thereof at each end of the bag length, and finallybottoming one end of the bag length.

ADOLPH mm.

